接下来尝试：

Question

我在内部使用了combobox的Datagridview，我无法在代码中设置索引我看过this和this - 都不起作用。

这是我的代码：

  dgShuffle.DataSource = dtCards;
  DataGridViewComboBoxColumn cmb = new DataGridViewComboBoxColumn();
  cmb.HeaderText = "Select Data";
  cmb.Name = "cmb";
  cmb.MaxDropDownItems = 2;
  cmb.Items.Add("real");
  cmb.Items.Add("sham");

  dgShuffle.Columns.Add(cmb);
  for (int i = 0; i < dgShuffle.RowCount; i++)
  {
       (dgShuffle.Rows[i].Cells[6] as DataGridViewComboBoxCell).Value = "real";
        // dgShuffle.Rows[i].Cells[6].Value = "real";
  }

按代码设置我的意思是：以编程方式（取决于datatble中的值）。我根本不会得到错误。该值根本不会显示在组合框中

我检查了组合框的索引，这是正确的，低于我的即时窗口的输出：

？dgShuffle.Rows [I] .Cells [6]

{DataGridViewComboBoxCell {ColumnIndex = 6，RowIndex = 0}} [System.Windows.Forms.DataGridViewComboBoxCell]：{DataGridViewComboBoxCell {ColumnIndex = 6，RowIndex = 0}}       base：{DataGridViewComboBoxCell {ColumnIndex = 6，RowIndex = 0}}       AccessibilityObject：{System.Windows.Forms.DataGridViewCell.DataGridViewCellAccessibleObject}       ColumnIndex：6       ContentBounds：{X = 0 Y = 12 Width = 0 Height = 0}       ContextMenuStrip：null       DefaultNewRowValue：null       显示：false       EditedFormattedValue：“”       EditType：{Name =“DataGridViewComboBoxEditingControl”FullName =“System.Windows.Forms.DataGridViewComboBoxEditingControl”}       ErrorIconBounds：{X = 0 Y = 0 Width = 0 Height = 0}       ErrorText：“”       FormattedValue：“”       FormattedValueType：{Name =“String”FullName =“System.String”}       冻结：假       HasStyle：false       InheritedState：可调整大小| ResizableSet |可见       InheritedStyle：{DataGridViewCellStyle {BackColor = Color [Window]，ForeColor = Color [ControlText]，SelectionBackColor = Color [Highlight]，SelectionForeColor = Color [HighlightText]，Font = [Font：Name = Microsoft Sans Serif，Size = 7.8，Units = 3，GdiCharSet = 177，GdiVerticalFont = False]，WrapMode = False，Alignment = MiddleLeft}}       IsInEditMode：false       OwningColumn：{DataGridViewComboBoxColumn {Name = cmb，Index = 6}}       OwningRow：{DataGridViewRow {Index = 0}}       PreferredSize：{Width = 43 Height = 26}       ReadOnly：false       可调整大小：真实       RowIndex：0       选中：假       尺寸：{宽度= 100高度= 24}       风格：{DataGridViewCellStyle {}}       标签：null       ToolTipText：“”       值：null       ValueType：{Name =“Object”FullName =“System.Object”}       可见：真实

接下来尝试：

我创建了一个新的winforms项目
将datagridview拖动到默认表单（来自工具箱）

将此代码复制到Form1_Load：

    DataTable dtCards;
    dtCards = new DataTable();
    dtCards.Columns.Add("printedString");
    dtCards.Rows.Add("1");
    dtCards.Rows.Add("2");
    dtCards.Rows.Add("3");
    dtCards.Rows.Add("4");
    dataGridView1.DataSource = dtCards;

    DataGridViewComboBoxColumn cmb = new DataGridViewComboBoxColumn();
    cmb.HeaderText = "Select Data";
    cmb.Name = "cmb";
    cmb.MaxDropDownItems = 2;
    cmb.Items.Add("real");
    cmb.Items.Add("sham");

    dataGridView1.Columns.Add(cmb);
    for (int i = 0; i < dataGridView1.RowCount; i++)
    {
        (dataGridView1.Rows[i].Cells[6] as DataGridViewComboBoxCell).Value = "real";
        // dgShuffle.Rows[i].Cells[6].Value = "real";
    }

我缺少什么？

Answer 1

您正在使用与数据源绑定的datagridview。您需要在数据源中指定该值。

在数据源中添加DataGridViewComboBoxColumn的值
然后将DataGridViewComboBoxColumn.DataPropertyName设置为数据源列/属性的名称

DataTable dtCards;
dtCards = new DataTable();
dtCards.Columns.Add("printedString");
dtCards.Columns.Add("comboboxValue", typeof(String)); //adding column for combobox
dtCards.Rows.Add("1", "real");
dtCards.Rows.Add("2", "real");
dtCards.Rows.Add("3", "real");
dtCards.Rows.Add("4", "real");


DataGridViewComboBoxColumn cmb = new DataGridViewComboBoxColumn();
cmb.HeaderText = "Select Data";
cmb.Name = "cmb";
cmb.MaxDropDownItems = 2;
cmb.Items.Add("real");
cmb.Items.Add("sham");
cmb.DataPropertyName = "comboboxValue"; //Bound value to the datasource

dataGridView1.Columns.Add(cmb);
dataGridView1.DataSource = dtCards;

在datagridview

接下来尝试：

1 个答案: